Sunbathing is the number one factor causing black spots, which will lead to melanin deposition, and some will form black spots if they cannot be metabolized.

2. Cosmetics

The use of expired or inferior cosmetics can lead to metal poisoning.

3. Bad living habits

Such as stress, picky eaters and lack of sleep will increase melanin.

4. The physiological structure of the face

The human face has the thinnest epidermis and the richest capillaries, and it is the easiest to form pigmentation.

5. Drug factors

9%~20% women who take oral contraceptives for a long time are prone to chloasma. In addition, taking drugs for hypertension and diabetes, or eating foods with strong photosensitivity such as celery and coriander are also easy to cause chloasma.

6. Reproductive causes, gynecological diseases such as hysteromyoma and hyperplasia of mammary glands, repeated abortion and medical abortion history. , will lead to endocrine sex hormone disorder, leading to pigmentation.

Extended data:

Types and symptoms of pigmentation:

1. stain type

Spots, including freckles, black spots, chloasma and senile spots, belong to pigmented diseases.

2. Freckles

Autosomal dominant hereditary dermatosis often occurs in young people, and it is more common in exposed parts such as face, neck and back of hand of teenagers. Light brown or dark brown spots, mostly symmetrically scattered, have a genetic tendency. It gets heavier in spring and summer and shallower in autumn and winter.

3. chloasma

It is an acquired disease with limited pigmentation, and it is the most common skin disease among women, especially those in the second to fifth month of pregnancy. Also known as butterfly spots, pregnancy spots, liver spots and so on. These diseases are all the same and are named according to different morphological and age characteristics.

References:

Spot _ Baidu encyclopedia